Make sample web server close connections
Make sample web server close connections

The sample web server, using nc, currently does not close the
connection after serving the content.  This can cause clients to
hang waiting for the connection to close after the content has been
served.  This patch includes the content length in the response
so that the connection will close.

Change-Id: I9443157f1edd8ed7e90599df73f5a48f16c955f1

openstack/octavia,openstack/octavia,openstack/octavia